Mexico has been more strident, saying it has no plans to vaccinate anyone under 18, other than an estimated one million minors with pre-existing conditions like diabetes or asthma. Government health officials argue that since minors don’t normally get serious cases of Covid-19, they don’t need the protection from a vaccine.

President Andrés Manuel López Obrador has said pharmaceutical companies want to scare countries into buying more vaccines, either for children or a third dose. “We’re not going to be hostage to that,” he said.

Parents in Mexico have sued the government to be allowed to vaccinate their children. A federal judge in October ordered the government to vaccinate minors, saying the policy violated Mexico’s constitution by discriminating against teens and children by blocking their access to a vaccine that was available to other age groups. The government has appealed the decision.